Drill press



Jan. 10, 1933,

F. c. AILLEN DRILL PRESS Filed Oct. 2. 1929 5 Sheets-Sheet F. C. ALLEN DRILL PRESS Jan. 10, 1933.

Filed Oct. 2, 1929 3 Sheets-Sheet 2 h. HW UH HF 0 Jan. 10, 1933. F. c ALLEN ,8

DRILL PRESS Filed Oc t. 2, 1929 s Sheets-Sheet s @52 TOP/YE Y Fatented .lan. 16, 1933 UNITED STATES FREDERICK C. ALLEN, OF HARTFORD, CONNECTICUT, ASSIGZrNOR TO THE HENRY &

WRIGHT MANUFACTURING C(I IFIPANY, DE HARTIEGBD, CONNECTICUT, A CORPORA- TION OF CONNECTICUT DRILL Application filed Gotober 2,

My invention relates to the class of machines employed for drilling purposes in manufacturing establishments and similar places, the invention relating particularly to a machine of this kind having means for rotating the drill spindle at variable rates of speed, and an object of my invention, among others, is the production of a machine of this type having means for effecting changes in speeds in a very efficient manner and with little trouble and annoyance.

One form of a machine embodying my invention and in the construction and use of which the objects herein set out, as Well as 15 others, may be attained is illustrated in the accompanying drawings, in which Figure 1 is a front view of a machine em bodying my invention, the lower part of the base being broken off and minor parts being omitted.

Figure 2 is a side view of the same.

Figure 3 is a top view with parts underneath removed.

Figure 4 is a view, scale enlarged, on a plane denoted by i the dotted line H of Figure 5 Figure 5'is a view in vertical section on a plane denoted by the dotted line 55 of Figure 4.

Figure 6 is a view approximately on a plane denoted by the dotted line 66 of Figure 5.

Figure 7 is a detail side view of the housing for the change speed mechanism and parts adjacent thereto.

Figure 8 is a detail view in central vertical 7 n through said housing and a portion only of the mechanism therein.

In the accompanyin drawings the numeral 10 indicates the base of my improved machine that may be of any suitable form with a column or standard 11 secured thereto and risthercfrom and having a supporting head 12 at the upper part thereof to receive and i port the driving and other mechanisms employed for operation of the drill. This driving mechanism, in the machine herein shown, includes driving shaft 13 rotatably 50 mounted. in a bracket projecting from the back of the base 10 and having any suitable means for rotating it, as a pulley or motor 14. This shaft 13 is operatively connected, as by means of gears, or other de ices, with a vertical shaft 15 having means atits upper end for imparting different rates of speed to a drill spindle. fiaid shaft mounted in a bearing in the support 12. and as a sui able means for ffecting said different rates of speed, I have iown a stepped or so-called cone pulley 16 cured to the upper end of said shaft and connected by a belt 1? with a similar pulley rotatably mounted above and upon the forward end of the supporting head 12. This pulley 18 is encased, if desired, in the box or similar protection 19. shown in Figure 5., but 01 iitted from other figures of the drawings.

A belt shifting mechanism is mounted on the top of the head 12, the mechanism in the form herein shown including guide posts 20 secrred to and rising from said head and comprising part of a frame that also includes a supporting bar 21 secured to said posts and extending beyond them to form supports for the upper ends of the shaft 15 and a drill spindle to be hereinafter described. A shifter post 22 projects upwardly through an opening" in the bar 21, and a shifter bar 23 is secured to said post and has openings for the posts 20 upon which said bar is guided in belt-shifting movements. Belt guides 24 project from opposite sides of the bar 23 to engage the belt in a manner that will be readilv unoerstood. The post 22 is provided with grooves to receive a detent 25 projectins later lly into the opening in the bar 21 with n which the post is located, said detent being spring-pressed to engage its end in said grooves and thereby retain the post in different positions to which it may be moved for location of the belt 17 on dilferent steps of the pulleys. A rack 26 rigid with and projecting from the lower end of the post 22 is engaged bv the teethof a pinion on a shaft 27 rotatably mounted in the head 12-, said shat having a bevel pinion secured thereto ard meshed with bevel pinion 28 on a belt sh ting shaft 29 rotatably mounted on the 12 and having a hand wheel 30 as a means ror manually shifting the belt.

A drill spindle 31 is mounted on the standard for longitudinal reciprocating movement thereon as by means of a bearing sleeve 32 for the lower end of said spindle, said sleeve being longitudinally movable in a spindle supporting bracket 33 secured to and projecting from the column 11. To effect such movement a rack 34 secured to the sleeve has its teeth meshed with the teeth of a pinion (not shown) on a spindle. shifting shaft rotatably mounted in the. bracket. 33 and having a handle as a means for lowering the sleeve and spindle against the force of a weight 35 suspended from a chain 36 passed over a sheave 37 loosely mounted on the shaft 27 and adjustably detachably engaged with notches in a bar 38 pivotally attached at one end to a collar 39 secured to the sleeve 32. That end of the bar 38 opposite the collar 39 is pivotally attached to the frame. of the machine and said collar is secured to the upper end of the sleeve 32 as by inter-engaging screw threads, as shown in Figure 5 of the drawings. As will be understood the spindleis ireely rotatable in the sleeve 32 but is secured thereto for longitudinal movement by means of a ring 40 secured to the spindle and engageable with a shoulder on the interior of the sleeve, said ring and a ball bearing to aid rotatable movement of the spindle in the sleeve being secured to the spindle as by means ofv a nut 41, as shown in Figure 5.

An important feature of my invention consists of means for insuring the engagement of the teeth of the gears of mechanism for effeeting different speeds of the spindle with little trouble and without danger of injury to the teeth of the gears or to other parts of the mechanism.

In carrying out this idea the pulley 18 is secured to a driving sleeve 42 freely rotatably mounted on the spindle and supported as by means of a ball bearing in a case 43 s-:- cured to the head 12. A driving gear 44 is secured in any suitable manner to the lower end of the sleeve, as by means of flanges on the gear and sleeve bolted together. For producing the faster rate of speed of the spindle, in the type of machine herein shown, the gear 44 is adapted to mesh directly with the-teeth of a spindle rotating. gear 45 splined to the spindle for longitudinal movement only thereon. The teeth of the gear 4-5 are formed on the wall. of a recess in the end of said. gear, as shown in Figure 5 of the drawings. The teeth on the periphery of said gear may be disregarded for the purposes of this application, these being embodied in a particular adaptation of the machine not shown herein but which forms the subject matter of another application for a patent. The gear 45 hasa hub 46 of considerable length. said hub being carried within ball bearings for its support and for support of the spindle, said ball bearings and a guard actuating sleeve 47, to be hereinafter described, being secured to the hub as by means of a nut 48 threadedly engaged with the hub, said sleeve properly spacing the bearings, as shown in Figure 5. Said bearings, sleeve and gear hub are supported for movement longitudinally on the spindle by means of a carrier 49-rotatab1y and longitudinally movable in a housing 50 secured to the under side of the forwardly projecting part of the head 12. A ring 5.1 is also secured to the end of the carrier as a means for support of the ball bearings.

As a means for shifting the carrier -19 to engage the gear -15 with the gear -14, I provide a gear shifting handle 52 projected through an angularly extending slot 53 through the wall of the housing 50 and extending circumferentially thereabont. When said handle is moved along said slot and reaches the up- I wardly inclined part thereof, it acts to raise the carrier and thereby mesh the teeth of the gears 44-. and 45 and when so meshed the spindle is driven directly from the gear 44.

It will be noted that the gear 44 is continuously operated with the pulley 18, and it will be appreciated that if an attempt be made to mesh the teeth of the gears 44 and 45 while the latter is rotating trouble will ensue. I have, therefore, provided means to prevent such a result. This is embodied in a guard 54 comprising a ring loosely mounted on the guard actuating sleeve 47, said ring having pins projecting inwardly to engage spiral grooves 55 in the outer surface of the sleeve 47. The sleeve 47 is always rotated with the gear 45, and when so rotated, the action of the spiral or cam grooves carries the guard 54 upwardly and locates it in the path of the movement of the end of a plunger pin 56 longitudinally movable in the handle 52, the outer end of the pin projecting beyond the end of the handle so that said pin may be pushed inwardly against the force of a spring within the handle tending normally to force the pin outwardly. The handle and hence the carrier 49 are held against rotating movement by means of a detent 57 spring pressed into engagement in a slot in the handle, as shown in Figure 5. It will be noted that said handle projects through the slot 50 and into and through the wall of the carrier -19, being held in place by a set screw, as shown in Figure 0.

The detent 57 is released from the slot in the handle by means of a releasing stud 58 projecting from the pin 56, said stud acting to press the detent downwardly from engagement with the handle when the pin 56 is pushed inwardly, as by the thumb of the op erator. It will be noted, however, that if the gear 45 is rotating, the guard 54 will be in the path of movement of the pin 56 and the latter cannot. therefore, be operated, to release the carrier for engagement of the gears 44 and 45, and the operation of the machine must thus be stopped before the gear may be shifted.

As a means for varying the rate of rotation of the spindle, I have provided a set of change gears adapted to operate through an indirectly driven gear 59 keyed to the hub of the gear 45. This comprises a change speed gear 60 and a change speed pinion 61 rigidly connected and rotatably mounted on ball bearings supported by a change speed spindle 62 eccentrically mounted in the head 12. The gear 60 is adapted to mesh with the gear let and the pinion 61 is adapted to mesh with the gear 59.

A gear shifter 63 has an eccentric hub '64 mounted in a bearing in a flange of the hcusing 50. Said shifter has teeth 55 meshing with teeth 66 formed on the periphery of the carrier 49, the latter teeth being of a length to permit the shifting movement of the carrier hereinbefore described. The pin 62 is keyed to the hub 84 and also to an eccentric bearing 67 mounted in an opening in the upper wall of the head 12.

lVhen the carrier at) and the handle 52 are in the positions shown in the drawings herein, the change speed gears are in an operative position and the spindle 31 will be driven at its lower rate of speed. If it is desired, to increase th speed of the spindle, the handle 52 is grasped by the operative, the pin 56 is pushed inwardly, provided the machine has been stopped and the guard 54 is, therefore, inoperative to prevent movement of said pin. If the machine is in operation, this movement of the pin will be prevented, as hereinhefore described. The pin being pushed inward the handle may be swung along the slot 53. During the preliminary movement of the handle along the horizontal part of the slot rotation of the carrier 49 only will take place. This will rotate the gear shifter 63 thereby carrying the change speed gears out of mesh with the gears 4 iand 59. This disengagement of the gears will be effected before the handle 52 reaches the inclined portion of the slot. When such portion of the slot is reached the handle traveling up the slot w'll carry the gear 45 into engagement with the gear l4, as hereinbefore described, and the spindle will be directly driven from the pulley 18. If a return to slower rotation of the spindle be desired, the handle 52 is move-d backwardly along the slot and a movement of the parts reverse to that just described will take place. It will be noted that in this operation the guard 54 will be operative to prevent engagement of the ch speed gea "s with the gears 44: and 59 unless the rotation of the pulley 18 has been stopped.

The detent 5'7 operates to hold the handle in the position shown in the figures of the drawings and a second and similar detent 68, shown in the dotted lines in Figure 7, is employed to hold the handle 52 in position to retain the change speed gears out of engagement.

In accordance with the provisions of the patent statutes I have described the priniples of operation of my invention, together with the device which I now consider to represent the best embodiment thereof; but I desire to have it understood that the device shown is only illustrative, and that the invention may be carried out by other means and applied to uses other than those above set out.

I claim 1. A drill press including a rotatably mounted spindle, mechanism for changing the rate of speed of rotation of said spindle, a. handle for operating said mechanism to efiect said change, a lock, a lock controlling member mounted in said handle to operate said lock and means actuated by the rotative force of the spindle to be moved into the path of movement of said lock controlling member to prevent operation of said operating mechanism until the spindle is at rest.

2. A drill press including a rotatably mounted spindle, mechanism for changing the rate of speed of rotation of said spindle, means for operating said mechanism to effect said change, anda member movably mounted on said spindle and actuated by the rotative force thereof to control movement of said operating mechanism until the spindle is at rest.

3. A drill press including a rotatably mounted spindle, mechanism for changing the rate of speed of rotation of said spindle, an actuating member for operating said mechanism to effect said change, and including a lock releasing member movably mounted on said actuating member, a lock member operated by said lock releasing member and means moved by the rotative force of rotation of the spindle into the path of movement of said lock releasing member to prevent its operation.

4. A drill press including a rotatably mounted spindle, mechanism for changing the rate of speed of rotatio of said spindle, means for operating said mechanism to effect said change and including an operating handle, means for locking said handle against movement, and a guard movable by the rotative force of said spindle into the path of movement of said handle to prevent unlocking movement thereof.

5. A drill press including a rotatably mounted spindle, me as for changing the rate of speed of rotation of said spindle, means for operating said mechanism to effect said change and including an operating handle, a lock pin engageable with the handle, a releasing pin for the lock pin movably mounted in said handle, and a guard movable by the rotative force of said spindle into the [nth of movement of said releasing pin to prevent releasing movement thereof.

6. A drill press including a rotatably mounted spindle, mechanism for changing the rate of speed of rotation of said spindle, means for operating said mechanism to effect said change, and a guard surrounding said spindle, and movable by the rotative force thereof to control movement of said operati 7 means until the spindle is at rest.

A drill press including a rotatably mounted spindle, mechanism for changing the rate of speed of rotation of said spindle, means for operating said mechanism to effect Slld change, a cam connected to rotate with said spindle, and a guard engaged with said cam and operated thereby to control movement of said operating means until the indie is at rest.

8. A drill press including a rotatably mounted spindle, mechanism for changing the rate of speed of rotation of said spindle, means for operating said mechanism to effect said change, a guard to control movement of said operating mechanism until the spindle is at rest, and a guard actuator rigidly' connected with said spindle and having a cam engaged with said guard for operation thereof.

9. A. drill press including a rotatably mounted spindle, mechanism for changing the rate of speed of rotation of said spindle, means for operating said mechanism to effect said change, a lock to govern operation of said operating'means, a guard to prevent releasing movement of said lock when the spindle is rotating, and a guard actuator rigidly connected with said spindle and having a cam engaged with said guard for operation thereof.

10. A drill press including a rotatably mounted spindle, mechanism including a gear for rotating said spindle at different rates of speed, means for operating said mechanism to effect said change, a guard to control movement of said operating means until the spindle is at rest, and a guard actnator secured to said gear to rotate therewith and having a cam groove engaged with said guard for operation thereof.

11. A drill press including a rotatably mounted spindle, mechanism for changing the rate of speed of rotation of said spindle, means for operating said mechanism to effect sa d change, a guard ring surrounding said spindle and movable longitudinally thereof to control movement of said operating means until the spindle is at rest, and a guard actuator surrounding said spindle and rotatable therewith and having a cam in engagement with said guard for operation thereof.

12. A drill press including a rotatably mounted spindle, mechanism for changing the rate of speed of rotation of said spindle, means for operating said mechanism to effeet said change, a lock to govern operation of said operating means, a lock operating member a guard surrounding said spindle and movable longitudinally thereof into the path of movement of said lock operating member until the spindle is at rest, and a guard actuating sleeve surrounding said spindle and rotatable therewith and having a cam engaged with said guard for operation thereof.

13. A drill press including a rotatably mounted spindle, mechanism for changing the rate of speed of rotation of said spindle, a carrier for a member of said speed changing mechanism, a handle to operate said carrier, a lock for said handle, and a guard surrounding said spindle and operative by the rotative force of said spindle to prevent unlocking operation of said handle until the spindle is at rest.

14. A drill press including a rotatably mounted spindle, mechanism for changing the rate of speed of rotation of said spindle, a rotatably mounted carrier for a member of said spccd changing mechanism, a handle to operate said carrier, a lock for said handle, and a guard surrounding said spindle and operative by the rotat ve force of said spindle to prevent unlocking operation of said handle until the spindle is at rest.

15. A drill press including a rotatably mounted spindle, mechanism for changing the rate of speed of rotation of said spindle, a longitudinally movable carrier rotatably mounted, said carrier supporting a member of said speed changing mechanism, a handle to operate said carrier. a lock for said handle and a guard surrounding said spindle and operative by the rotative force thereof to prevent unlocking operation of said handle until the spindle is at rest.

16. A drill press including a rotatably mounted spindle, mechanism for changing the rate of speed of rotation of said spindle, a carrier rotatably and longitudinally movable and supporting a member of said speed changing mechanism, a handle projecting from said carrier into a slot with an inclined portion to ellcct longitudinal movement of the carrier, a lock for said handle. and a guard surrounding said spindle and operative by the rotative force thereof to prevent unlocking operation of said handle until the spindle is at rest.

17. A drill press including a rotatably mounted spindle, mechanism for changing the rate of speed of rotation of said spindle, a hous ng within which said mechanism is located, said housing having an in lined slot through the wall. thereof. a carrier located in said housing and supporting a member of said speed charging mechanism. handle projecting from the carrier through said slot, a lock for said handle. and a smard surrounding said spindle and operative by the rotative force thereof to prevent unlocking operation of said handle until the spindle is at rest.

18. A drill press including a rotatably mounted spindle, a driving element, mechanism for changing the rate of speed of rotation of said spindle and including two members adapted to be engaged with said driv ing element, a rotatably mounted and longi l tudinally movable carrier supporting one of said members, means for operating the other of said members to effect a change in speed, said carrier being operatively connected with said operating means, a handle projecting 15 from said carrier, a housing having a slot through which said handle projects, said slot having an inclined portion to effect engagement of one or" said members with the driving member only after disengagement of the 20 other member from the driving element, a

lock for said handle, and a guard surrounding said spindle and operative by the rotative force of said spindle to prevent unlocking operation of said handle until the spindle 2 is at rest.

19. A drill press including a rotatably mounted spindle, a driving elementfreely rotatably mounted on said spindle, a spindle rotating member splined to said spindle for 00 engaging and disengaging action with respect to said driving element, a spindle rotating gear secured to said spindle, a carrier rotatably mounted with respect to said spindle and longitudinally movable thereon, a set of change speed gears connecting said driving element and said spindle rotating gear, a change speed spindle upon which said change speed gears are mounted, an eccentrically mounted bearing for said change 1 40 speed spindle, a toothed connection between saidcarrier and said eccentrically mounted bearing, and means for operating the carrier. 20. A drill press including a rotatably mounted spindle, a driving gear secured to 4 said spindle, a carrier surrounding said spindle and rotatable and longitudinally movable thereon, means for actuating said carrier, a spindle rotating gear splined to said spindle and supported on said carrier, a second spindle rotating gear secured to the hub of the first mentioned spindle rotating gear, an eccentrically mounted bearing having a toothed connection with said carrier, means for efiecting longitudinal movement of said carrier for rotating it, a change speed spindle secured to said bearing, and a set of change speed gears rotatably mounted on said change speed spindle and adapted to be meshed with and unmeshed from said driving gear and said second spindle rotatmg gear.

FREDERICK C. ALLEN. 

